I could try to grind down the PCB of a TL-WR703N and scan the single copper layers? Like Squonk already explained. I have access to some machines and enough craftsmanship. I think it's worth a try and I am happy to donate one TL-WR703N.
Please let me know if this is still needed for finishing or verifying the schematics.
Yes, it would be very helpful!
Unless we have an X-Ray machine for PCBs, this is the only method available to find out what is on the internal layers.
As I found out, there are mostly power planes, but there should be a few data signals, too, as I was able to determine using a DMM.
I don't know for sure how many internal layers are in, so you must be careful when grinding down the PCB.
But this would confirm for sure what's in there, and provide the full layout, not just the schematic.
Thank you for your offer, please let me know about the result, so I can integrate your work in the reverse engineering job with proper reference to it.
(Last edited by Squonk on 2 Dec 2012, 15:22)